The last confirmed sighting of Kirsty, of Robroyston, Glasgow, was on the city’s Broomielaw after parts of her 16-minute journey from the Sauchiehall Street bar down to the riverside were captured on CCTV.

It is thought she could have been going to meet pals at the Grosvenor Casino Riverboat when she vanished at 3.16am.

On Wednesday, Kirsty’s mum Fay watched divers scour the Clyde close to the spot she was last seen. The operation continued yesterday, with search teams moving slowly down the river.